Reduce checkbox size to 15px (#30346)
16 seems to big, 14 too small. Let's do 15. Alignment:
<img width="181" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/f2988611-dee2-492e-a18f-dc5ab3a1cd6c">
(cherry picked from commit 72dc75e594fb5227abfa1cb74cb652cc33bacc93)
authored by